The U.S. Agriculture Department told Reuters it had pulled all staff from Pro Farmer Crop Tour after an employee received a threatening phone call from an upset farmer. The Crop Tour started on Monday and will wrap up later in the week.
At Profarmer.com they had this to say:
We are sad to report a USDA National Agricultural Statistics Service (NASS) employee received a phone threat while on the Pro Farmer Crop Tour from someone not involved with the tour. As a precaution, USDA immediately pulled all their staff out of the event. Federal Protective Services are investigating the incident.
We are taking the threat very seriously and the safety of all those involved in Tour is our top priority. As a precaution, we are taking steps to secure the remaining location venues, adding security personal at the live events as well as asking staff and crop tour scouts to remain aware and report any concerns immediately. Lance Honig, crops chief at NASS, and other USDA staffers have canceled meeting appearances for Wednesday.